S3 and Bluetooth Questions

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http://forums.androidcentral.com – I just bought a Bluetooth device to use with my s3 while driving. It's not working how I thought it would, so I was wondering what it should be doing and what settings can be changed. 1. I have my phone plugged into an aux port. When I get a phone call, the call audio goes through the car speakers instead of the Bluetooth speakers. I know there is a bug with the s3 regarding Bluetooth and aux, but ideally, I would like the phone call audio to go through the Bluetooth speaker. 2. I'm in an app and want to use an in-app voice search. The phone uses the internal mic and not the Bluetooth (HowTos)